JP4326444B2 - Throttle body with fuel injection valve for motorcycle - Google Patents

Description

The present invention, the fuel in the fuel tank is pressurized with the fuel pump, the boosted fuel relates injecting and supplying fuel injector into an intake passage of the throttle body via the fuel injection valve is attached to the throttle body , in particular, it relates to an improvement of the fuel injection valve with the throttle body for a motorcycle.

A throttle body with fuel injection in a conventional fuel injection apparatus is shown in FIG.
FIG. 5 is a longitudinal sectional view along the intake passage of the throttle body.
Reference numeral 1 denotes a throttle body in which an intake passage 2 penetrates the interior sideways. The intake passage 2 is a butterfly type attached to a throttle valve shaft 3 rotatably supported by the throttle body 1. The throttle valve 4 is used to control the amount of air supplied to the engine.
In FIG. 5, the right side of the intake passage 2 is connected to an air cleaner (not shown), and the left side of the intake passage is connected to an engine (not shown).
Above the side wall of the throttle body 1 in which the fuel injection valve J is arranged toward the lower left portion, the fuel injection valve J is shown in JP 2001-19 3 600 JP example.
The fuel injection valve J has an injection side front end portion Ja provided with an injection hole at the front end side thereof, a fuel inflow side rear end portion Jb provided with a fuel inflow passage for supplying fuel toward the inside at the rear end side thereof, and the side thereof. And an external connection connector Jc for supplying a current toward the internal electromagnetic coil.
The injection side front end portion Ja of the fuel injection valve J is inserted into the injection valve support hole 1a formed in the throttle body 1, and the fuel inflow side rear end portion Jb is connected to the injection valve support hole of the fuel distribution pipe 5. 5 a is inserted, and in this state, the flange portion 5 c of the fuel distribution pipe 5 is screwed to the throttle body 1 by the screw 6.
According to the above, the fuel injection valve J is sandwiched between the throttle body 1 and the fuel distribution pipe 5 and fixedly disposed on the throttle body 1.
The fuel boosted by a fuel pump (not shown) is supplied into the fuel distribution pipe 5 from the fuel introduction pipe 7 extending laterally from the fuel distribution pipe 5, and this fuel is drilled in the fuel distribution pipe 5. The fuel is supplied toward the fuel inflow side rear end Jb of the fuel injection valve J through the fuel distribution pipe 5b.
On the other hand, a female connector 8 having a conductor 8a connected to an ECU (not shown) is fitted and connected to the external connection connector Jc.
Thus, when an electric current is passed from the ECU to the electromagnetic coil in the fuel injection valve J via the female connector 8 and the external connection connector Jc, the fuel injection valve J converts the electric signal into a fuel flow rate from the ECU. The fuel based on the injection signal is injected and supplied into the intake passage 2 of the throttle body 1.
JP 2001-193600 A

According to such a conventional throttle body, in which the fuel injection valve is arranged directly exposed to the side wall of the throttle body, not particularly be preferred in the following points Oite the motorcycle according to this.
The first fuel injection valve, the lower of the fuel tank to protect the fuel distribution pipe from the outside of the obstacle, particularly wide installation space Oite the motorcycle having no need to set them arranged properly Therefore, it takes a lot of development time to select the layout.
Secondly, rainwater, muddy water, etc. and mud, sand, etc., are directly sprinkled on the mating connection between the external connector and female connector 8, and a great deal of development time is required to protect them against water and dust. I need.
Third, during operation of the engine, the fuel injection valve generates a driving sound. Particularly, in a two-wheeled vehicle in which the driver is located near the fuel injection valve, the driving sound is anxious for the driver and is long. It contributes to driver fatigue when driving for hours.

The present invention has been made in view of the above problems, and the throttle body provided with the fuel injection valve has a high degree of freedom in arrangement with respect to the vehicle, and is waterproof and dustproof at the fitting connection portion between the external connection connector and the female connector. It is an object of the present invention to provide a throttle body with a fuel injection valve for a motorcycle that can be easily performed and can effectively cut off the drive sound of the fuel injection valve .

In order to achieve the above object, according to the present invention , an injection-side tip portion of a fuel injection valve for injecting fuel into the intake passage is inserted and disposed in a first injection valve support hole of a throttle body having an intake passage. The rear end portion of the fuel inflow side of the fuel injection valve is inserted and disposed in the second injection valve support hole of the fuel distribution pipe, and the fuel injection valve is sandwiched between the throttle body and the fuel distribution pipe, and the outside of the fuel injection valve. In a throttle body with a fuel injection valve for a motorcycle, in which a female connector with a lead wire connected to an external power source is fitted and connected to the connector for the connection, the bottom of the throttle body opens upward with an upper mounting flange on said upper mounting flange portion with integrally provided cupped bottom cup, the lower mounting flange portion of the bottomed cup-shaped upper cup opening downward to contact a fixed, pre A housing chamber formed by a lower cup and the upper cup, the fuel injection valve, while accommodating placing the fuel distribution pipe and the female connector, on the side wall of the storage chamber, the upper mounting flange portion and the lower mounting A takeout groove that is notched toward the mutual contact surfaces of the flanges and opens to the inside and outside of the storage chamber in a direction perpendicular to the longitudinal direction of the intake passage is provided, and is connected to the fuel distribution pipe through the takeout groove. The first feature is that the fuel introduction pipe is pulled out of the storage chamber .

In addition to the first feature of the present invention, a pair of the throttle bodies are arranged adjacent to each other so that their intake passages are parallel to each other and fixed to the lower cup 1c of the pair of throttle bodies. The pair of upper cups are provided with the take-out grooves so that they face each other, the fuel introduction pipes drawn from these take-out grooves are provided, and the inflow passage disposed between the pair of throttle bodies is provided in the middle part. A second feature is that the fuel supply pipe is constituted by a single common fuel introduction pipe .

Furthermore, in addition to the first or the second feature, the present invention provides an insertion direction of the fuel inflow side rear end portion of the fuel injection valve into the second injection valve support hole and the fuel from the take-out groove. A third feature is that the direction of drawing out the introduction pipe is orthogonal.

According to the first aspect of the present invention, the fuel injection valve, the fuel distribution pipe connected to the rear end of the fuel inflow side, and the female connector connected to the external connection connector of the fuel injection valve are: It arrange | positions in the storage chamber formed of the lower cup formed integrally and the upper cup which covers it.
On the other hand, the fuel introduction pipe extending laterally from the fuel distribution pipe disposed in the storage chamber is drawn out to the outside through an extraction groove provided in the upper cup.

According to the above, the fuel injection valve, the fuel distribution pipe and a female connector is arranged in the housing chamber, they without colliding with an external obstacle, Oite the motorcycle, a high degree of freedom in the arrangement, In addition, the arrangement can be selected appropriately in a very short time.
Further, according to the fitting connection between the external connection connector and the female connector is disposed in the housing chamber, rain, or mud, mud, dust, and the like befell deposited it to the fitting connection portion Therefore, stable electrical connection can be maintained for a long time.
Further, since the fuel injection valve is arranged in the storage chamber, it is possible to prevent the drive sound generated from the fuel injection valve from leaking to the outside. Deterred.
Furthermore, according to the fact that the storage chamber is formed by the lower cup integrally formed with the throttle body and the upper cup that covers it, the storage chamber can be formed very easily without increasing the number of parts and the conventional constant vacuum type. Since an external shape close to that of a carburetor can be formed, it is preferable as a throttle body with a fuel injection valve for a motorcycle that has a retro appearance.
Furthermore, a take-out groove that is notched toward the abutment surface between the upper mounting flange and the lower mounting flange and that opens to the inside and outside of the storage chamber in a direction perpendicular to the longitudinal direction of the intake passage is formed on the side wall of the storage chamber. Since the fuel introduction pipe connected to the fuel distribution pipe is drawn out of the storage chamber through the take-out groove, the fuel injection valve is fixedly arranged on the throttle body using the fuel distribution pipe and the connector for external connection. After the female connector is fitted and connected to the upper cup, the upper cup is attached to the lower cup, and the fuel introduction pipe can be taken out and placed in the groove, so that the attachment of the upper cup can be improved.
In addition, maintenance workability of the fuel distribution pipe and the female connector can be improved.

Further, according to the second feature of the present invention, a pair of take-out grooves formed in a pair of adjacent throttle bodies are arranged so as to face each other, and a space between a pair of fuel introduction pipes drawn out from these take-out grooves is provided between the pair of throttle bodies. Since the inflow passage arranged at the center is constituted by a single common fuel introduction pipe provided in the intermediate portion, fuel can be supplied to the fuel distribution pipe of each throttle body using the common single fuel introduction pipe. The

An embodiment of a throttle body in the fuel injection device according to the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view in the longitudinal direction of an intake passage. FIG. 2 is a side view of FIG. FIG. 3 is a perspective view showing a state in which the upper cup is removed.
The same parts as those in FIG.
The fuel injection valve J is inserted and supported by the injection valve support hole 1a of the throttle body 1 and the injection valve support hole 5a of the fuel distribution pipe 5 as in the prior art, and is sandwiched between the throttle body 1 and the fuel distribution pipe 5.
The external connection connector Jc of the fuel injection valve J is fitted and connected to a female connector 8 having a conductor 8a.
A bottomed cup-shaped lower cup 1c that opens upward is integrally formed on the upper wall 1b of the throttle body 1.
The lower cup 1c is formed in a cup shape so as to surround the fuel injection valve J, and an upper mounting collar 1d is formed in the circumferential direction at the upper end.
The fact that the lower cup 1c surrounds the fuel injection valve J means that the fuel injection valve J is disposed in the upper opening of the lower cup 1c when the lower cup 1c is viewed from above in FIG. At this time, in this embodiment, the female distribution pipe 5 including the fuel introduction pipe 7 inserted into the fuel inflow side rear end Jb of the fuel injection valve J and the female including the conductor 8a fitted and connected to the external connection connector Jc. The mold connector 8 is disposed so as to protrude above the upper mounting flange 1d of the lower cup 1c. Reference numeral 9 denotes a bottomed cup-shaped upper cup which is disposed on the upper mounting flange 1d of the lower cup 1c and whose lower side opens with the lower mounting flange 9a. The lower mounting flange 9a of the upper cup 9 is disposed on the upper mounting flange 1d of the lower cup 1c. In this state, the lower mounting flange 9a is screwed toward the upper mounting flange 1d. According to this, a closed storage chamber 10 is formed by the lower cup 1 c and the upper cup 9.
On the other hand, an extraction groove 9c is formed in the side wall 9b of the upper cup 9, and the extraction groove 9c is notched toward the lower end surface 9a1 of the lower mounting flange 9a and is orthogonal to the longitudinal direction of the intake passage 2. Open in and out of the upper cup 9 in the direction .
The take-out groove 9c has a groove shape for inserting at least the fuel introduction pipe 7 and the conductor 8a. In other words, the take-out groove 9c is cut out from the lower end surface 9a1 of the lower mounting flange 9a. . Further, the insertion direction of the fuel inflow side rear end portion of the fuel injection valve J into the injection valve support hole 5b, the fitting direction of the female connector 8 to the external connection connector Jc, and the fuel introduction pipe from the take-out groove 9c. 7 and the lead-out direction of the conducting wire 8a are set to be orthogonal to each other.
The takeout groove 9c is best shown in FIG.

Here, the assembly of the upper cup 9 will be described.
First, the fuel injection valve J is sandwiched and fixed to the throttle body 1 by the fuel distribution pipe 5 as described above, and the female connector 8 is fitted and connected to the external connection connector Jc of the fuel injection valve J. According to the above, the fuel injection valve J including the fuel distribution pipe 5, the external connection connector Jc, and the female connector 8 are disposed inside the opening of the lower cup 1c.
On the other hand, the fuel introduction pipe 7 connected to the fuel distribution pipe 5 and the conductor 8a connected to the female connector 8 are located above the upper mounting flange 1d of the lower cup 1c and outward of the lower cup 1c. Extend towards.
This state is clearly shown in FIG.
Next, the lower mounting flange 9a of the upper cup 9 is placed in contact with the upper mounting flange 1d of the lower cup 1c. At this time, the fuel introduction pipe 7 and the conductor 8a are drilled in the side wall 9b of the upper cup 9. In this state, the lower attachment flange 9a of the upper cup 9 is screwed and fixed onto the upper attachment flange 1d of the lower cup 1c.
According to the above, the closed storage chamber 10 is formed by the lower cup 1c and the upper cup 9, and the fuel injection valve J including the fuel distribution pipe 5, the external connection connector Jc, and the female connector 8 are On the other hand, the fuel introduction pipe 7 and the conducting wire 8a are drawn out from the storage chamber 10 through the take-out groove 9c.
A fuel pipe (not shown) connected to a fuel pump (not shown) is connected to the fuel introduction pipe 7 drawn to the outside, and the conductor 8a is electrically connected to an ECU (not shown).

  Thus, the fuel boosted by the fuel pump is supplied from the fuel pipe to the fuel injection valve J through the fuel introduction pipe 7 and the fuel distribution pipe 5, while the electrical signal output from the ECU is a conductor 8a, female type. It is supplied to the electromagnetic coil in the fuel injection valve J through the connector 8 and the external connection connector Jc.

According to the throttle body constituted as described above, the fuel injection valve J and the fuel distribution pipe 5 inserted into the fuel inflow side rear end Jb of the fuel injection valve J and the female connector 8 fitted and connected to the external connection connector Jc are provided. Since it is stored and arranged in the storage chamber 10 formed by the lower cup 1c and the upper cup 9, obstacles do not directly contact while the vehicle is running or when the vehicle falls.
Therefore, the degree of freedom of arrangement of the throttle body can be greatly improved, and the arrangement can be selected in a very short time.
This is particularly effective in motorcycles and general-purpose machines in which the throttle body is directly exposed to the outside.
Also, according to the fact that the external connection connector Jc and the female connector 8 are arranged in the storage chamber 10, it is possible to suppress adhesion of water, mud, etc. to these fitting connection portions, and for a long period of time. A stable electrical connection can be maintained.
Further, since the fuel injection valve J is disposed in the storage chamber 10, it is possible to prevent the drive sound generated in the fuel injection valve J from leaking to the outside and reduce the driver's fatigue.
Further, when the lower cup 1c forming the storage chamber 10 and the throttle body 1 are formed integrally, an increase in the number of parts can be suppressed, and the manufacturing cost can be reduced.
In addition, the shape of the storage chamber 10 to be stored in the fuel injection valve J or the like has an external appearance (cylindrical shape) similar to that of the constant vacuum type carburetor. According to this, as a throttle body for a motorcycle that likes a retro external appearance shape. preferable.
Further, when the upper cup 9 is assembled to the lower cup 1c, the fuel introduction pipe 7 and the conductor 8a can be inserted into the take-out groove 9c through the opening of the lower end surface 9a1 of the upper cup 9, so that the fuel introduction pipe 7 and The conducting wire 8a can be easily taken out of the storage chamber 10, and the ease of assembly and the maintenance of the fuel distribution pipe 5 and the female connector 8 can be improved.

Next, FIG. 4 shows an embodiment of a double throttle body in which the throttle body 1 as described above is paired adjacently .
In this example, the throttle body 1 shown in FIG. 1 is disposed adjacent to each other with a pair of left and right, the longitudinal axis of the throttle valve shaft 3 being concentric, and the intake passages 2 being parallel.
Here, for ease of explanation, the left throttle body in FIG. 4 is referred to as a first throttle body 1 ', and is referred to as a first ... before the components used for it.
For example, it is called a first fuel distribution pipe 5 '.
In FIG. 4, the right throttle body is called the second throttle body 1 ″, and the second part is called before the components used for it.
For example, it is called a second fuel distribution pipe 5 ″.
In the first storage chamber 10 'of the first throttle body 1', a first fuel injection valve J 'is fixedly arranged on the first throttle body 1' by a first fuel distribution pipe 5 '. The first female connector 8 ′ is fitted and connected to the first external connection connector Jc ″.
(The first external connector Jc ′ and the first female connector 8 ′ are not shown)
A second fuel injection valve J ″ is fixed to the second throttle body 1 ″ by a second fuel distribution pipe 5 ″ in the second storage chamber 10 ″ of the second throttle body 1 ″. Further, the second female connector 8 ″ is fitted and connected to the second external connection connector Jc ″.
(The second external connection connector Jc ″ and the second female connector 8 ″ are not shown), and the first fuel distribution path toward the right end surface of the first fuel distribution pipe 5 ′. A first fuel introduction pipe insertion hole 5e 'communicated with 5b' is opened.
Further, a second fuel introduction pipe insertion hole 5e ″ connected to the second fuel distribution path 5b ″ opens toward the left end surface of the second fuel distribution pipe 5 ″.
Then, both ends of the straight common fuel introduction pipe 7 are inserted and arranged into the first fuel introduction pipe insertion hole 5e ′ and the second fuel introduction pipe insertion hole 5e ″. The fuel introduction pipe 7 includes an inflow passage 7a disposed between the throttle bodies 1 ′ and 1 ″ at an intermediate portion.
Here, the fuel injectors J ′, J ″ are fixed to the throttle bodies 1 ′, 1 ″ by the fuel distribution pipes 5 ′, 5 ″ and the external connection connectors Jc ′, Jc ″, The female connectors 8 'and 8''are fitted and connected before the upper cups 9' and 9 '' are assembled. At this time, the fuel introduction pipe 7 is connected to the first throttle body 1 '. It protrudes rightward from the first fuel distribution pipe 5 ′ and reaches the second fuel distribution pipe 5 ″ of the second throttle body 1 ″.
The first conductor 8a ′ extends from the first throttle body 1 ′ to the right, and the second conductor 8a ″ extends from the second throttle body 1 ″ to the left.
On the other hand, a first take-out groove 9c 'is cut out in the opposing side wall 9d (right side wall 9d) of the first upper cup 9' toward the first lower end surface 9a1 '.
Further, a second take-out groove 9c ″ is formed in the opposing side wall 9e (left side wall 9e) of the second upper cup 9 ″ by cutting out toward the second lower end surface 9a1 ″.
Then, the first lower mounting flange portion 9a 'of the first upper cup 9' is disposed in contact with the first upper mounting flange portion 1d 'of the first lower cup 1c'.
According to the above, the first storage chamber 10 'is formed by the first lower cup 1c' and the first upper cup 9 ', and the first fuel distribution pipe 5' is provided in the first storage chamber 10 '. The first fuel injection valve J 'and the first female connector 8' fitted and connected to the first external connection connector Jc 'are housed and arranged, while the fuel introduction pipe 7 and the first conductor 8a. 'Is pulled out to the right outward from the first extraction groove 9c'.
In addition, the second lower mounting flange portion 9a ″ of the second upper cup 9 ″ is disposed in contact with the second upper mounting flange portion 1d ″ of the second lower cup 1c ″. .
According to the above, the second storage chamber 10 ″ is formed by the second lower cup 1c ″ and the second upper cup 9 ″, and the second fuel distribution pipe is formed in the second storage chamber 10 ″. A second fuel injection valve J ″ having 5 ″ and a second female connector 8 ″ fitted and connected to the second external connection connector Jc ″ are accommodated and disposed, while fuel is introduced. The tube 7 and the second conducting wire 8a ″ are drawn out to the left outward from the second extraction groove 9c ″.

  As described above, in a multi-connected throttle body in which a plurality of throttle bodies are arranged on the side, the take-out grooves 9c 'and 9c' 'are formed in the opposing side walls 9d and 9e of the upper cups 9' and 9 ''. According to the construction, a straight single pipe can be used as the fuel introduction pipe 7 and the conductors 8a ′ and 8a ″ are combined into a pair between the throttle bodies 1 ′ and 1 ″. It can be wired to the ECU, and space saving of fuel piping and conductor wiring can be achieved.

The longitudinal cross-sectional view in the longitudinal direction of an intake passage which shows one Example of the throttle body in the fuel-injection apparatus which becomes this invention. The side view of FIG. The perspective view in the state in which the upper cup was removed in FIG. The front view which shows the other Example of the throttle body in the fuel-injection apparatus which becomes this invention. The longitudinal cross-sectional view in the longitudinal direction of the intake passage which shows the conventional throttle body.

1 Throttle body
1 ', 1 "pair of throttle bodies
1a 1st injection valve support hole 1c Lower cup 1d Upper attachment collar
2 Intake passage 5 Fuel distribution pipe 7 Fuel introduction pipe 8 Female connector 8a Conductor 9 Upper cup 9a Lower mounting flange 9b Side wall 9c Extracting groove 10 Storage chamber J Fuel injection valve
Ja Injection side tip Jc External connector

Claims (3)

An injection side tip (Ja) of a fuel injection valve (J) that injects fuel into the intake passage (2) in a first injection valve support hole (1a) of a throttle body (1) having an intake passage (2). Is inserted and disposed, and the fuel inflow side rear end (Jb) of the fuel injection valve (J) is inserted and disposed in the second injection valve support hole (5a) of the fuel distribution pipe (5) . (J) is a female connector (8) that is sandwiched between the throttle body (1) and the fuel distribution pipe (5) and that has an external connection connector (Jc) of the fuel injection valve (J) and a lead wire connected to an external power source. In a throttle body with a fuel injection valve for motorcycles ,
The upper surface of the throttle body (1), on the upper mounting flange portion provided with an upper mounting flange portion with a bottom cup-shaped lower cup (1d) with opening upward (1c) integrally (1d), the lower A storage chamber (10) formed by the lower cup (1c) and the upper cup (9) by abutting and fixing the lower mounting flange (9a) of the upper cup (9) having a bottomed cup shape opening to the bottom The fuel injection valve (J), the fuel distribution pipe (5), and the female connector (8) are accommodated in the housing , and the upper mounting flange is disposed on the side wall (9b) of the accommodation chamber (10). (1d) and a lower mounting flange (9a) A takeout groove (notched toward the mutual abutment surface) and opened to the inside and outside of the storage chamber (10) in a direction perpendicular to the longitudinal direction of the intake passage (2) 9c) through this take-out groove (9c) , Characterized in that the drawer fuel inlet pipe connected to the fuel distribution pipe (5) to (7) to the storage chamber (10) outside the fuel injection valve with the throttle body for a motorcycle. The throttle body with a fuel injection valve for a motorcycle according to claim 1,
A pair of throttle bodies (1 ′, 1 ″) are arranged adjacent to each other so that their intake passages (2 ′, 2 ″) are parallel to each other, and this pair of throttle bodies (1 ′, 1 ″) A pair of the extraction grooves (9c ′, 9c ″) provided correspondingly are arranged so as to oppose each other, and the fuel introduction pipe drawn out from the extraction grooves (9c ′, 9c ″) is provided. A motorcycle comprising an inflow passage (7a) disposed between the pair of throttle bodies (1 ', 1 ") as a common fuel introduction pipe (7) having an intermediate portion. Throttle body with fuel injection valve . The throttle body with a fuel injection valve for a motorcycle according to claim 1 or 2,
The insertion direction of the rear end of the fuel inflow side of the fuel injection valve into the second injection valve support hole (5a) intersects with the direction of drawing out the fuel introduction pipe (7) from the extraction groove (9c). A throttle body with a fuel injection valve for motorcycles.

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